package com.warm.service.impl;

import com.sun.org.apache.regexp.internal.RE;
import com.warm.converter.OrderMaster2OrderDTOConverter;
import com.warm.dataobject.OrderDetail;
import com.warm.dataobject.OrderMaster;
import com.warm.dataobject.ProductInfo;
import com.warm.dto.CartDTO;
import com.warm.dto.OrderDTO;
import com.warm.enums.OrderStatusEnum;
import com.warm.enums.PayStatusEnum;
import com.warm.enums.ResultEnum;
import com.warm.exception.SellException;
import com.warm.repository.OrderDetailRepository;
import com.warm.repository.OrderMasterRepository;
import com.warm.service.OrderService;
import com.warm.service.ProductService;
import com.warm.service.PushMessageService;
import com.warm.utils.KeyUtil;
import com.warm.websocket.WebSocket;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Created by liangchuang on 2018/9/4.
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private ProductService productService;

    @Autowired
    private OrderDetailRepository orderDetailRepository;

    @Autowired
    private OrderMasterRepository orderMasterRepository;

    @Autowired
    private PushMessageService pushMessageService;

    @Autowired
    private WebSocket webSocket;

    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {

        String orderId = KeyUtil.genUniqueKey();
        BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO);
        //BigDecimal orderAmount = new BigDecimal(0);

        //List<CartDTO> cartDTOList = new ArrayList<>();

        //1.查询商品（数量、价格）
        for(OrderDetail orderDetail : orderDTO.getOrderDetailList()){
            ProductInfo productInfo = productService.findOne(orderDetail.getProductId());
            if(productInfo == null){
                throw new SellException(ResultEnum.PRODUCT_NOT_EXIST);
            }
            //2.计算订单总价
            orderAmount = productInfo.getProductPrice().
                    multiply(new BigDecimal(orderDetail.getProductQuantity())).
                    add(orderAmount);

            //订单详情入库
            orderDetail.setDetailId(KeyUtil.genUniqueKey());
            orderDetail.setOrderId(orderId);

            //将对象属性拷贝 值为null 也会拷贝 覆盖
            BeanUtils.copyProperties(productInfo, orderDetail);
            orderDetailRepository.save(orderDetail);

            //CartDTO cartDTO = new CartDTO(orderDetail.getProductId(), orderDetail.getProductQuantity());
            //cartDTOList.add(cartDTO);
        }

        //3.写入数据库（OrderMaster  OrderDetail）
        OrderMaster orderMaster = new OrderMaster();
        //将对象属性拷贝 值为null 也会拷贝 覆盖orderStatus和payStatus
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO, orderMaster);
        orderMaster.setOrderAmount(orderAmount);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());


        orderMasterRepository.save(orderMaster);

        //4.扣库存
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream().
                map(e -> new CartDTO(e.getProductId(), e.getProductQuantity())).
                collect(Collectors.toList());
        productService.decreaseStock(cartDTOList);

        //发送websocket消息
        webSocket.sendMessage(orderDTO.getOrderId());

        return orderDTO;
    }

    @Override
    public OrderDTO findOne(String orderId) {

        OrderMaster orderMaster = orderMasterRepository.findOne(orderId);
        if(orderMaster == null){
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }
        List<OrderDetail> orderDetailList = orderDetailRepository.findByOrderId(orderId);
        if(CollectionUtils.isEmpty(orderDetailList)){
            throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST);
        }

        OrderDTO orderDTO = new OrderDTO();
        BeanUtils.copyProperties(orderMaster, orderDTO);
        orderDTO.setOrderDetailList(orderDetailList);
        return orderDTO;
    }

    @Override
    public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) {
        Page<OrderMaster> orderMasterPage = orderMasterRepository.findByBuyerOpenid(buyerOpenid, pageable);
        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());
        Page<OrderDTO> orderDTOPage = new PageImpl<OrderDTO>(orderDTOList, pageable, orderMasterPage.getTotalElements());
        return orderDTOPage;
    }


    @Override
    @Transactional
    public OrderDTO cancle(OrderDTO orderDTO) {
        OrderMaster orderMaster = new OrderMaster();


        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("【取消订单】订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }
        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO, orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if(updateResult == null){
            log.error("【取消订单】更新失败, orderMaster={}", orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        //返回库存
        if(CollectionUtils.isEmpty(orderDTO.getOrderDetailList())){
            log.error("【取消订单】 订单中无商品详情， ordetDTO={}", orderDTO);
            throw new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
        }
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream().
                map(e -> new CartDTO(e.getProductId(), e.getProductQuantity())).
                collect(Collectors.toList());
        productService.increaseStock(cartDTOList);

        //若已支付，则需要退款
        if(orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS.getCode())){
            //TODO
        }
        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO finish(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("【完结订单】 订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }
        //修改状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO, orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if(updateResult == null){
            log.error("【完结订单】更新失败, orderMaster={}", orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        //推送微信模板消息
        pushMessageService.orderStatus(orderDTO);

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("【订单支付完成】 订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }
        //判断支付状态
        if(!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode())){
            log.error("【订单支付完成】 订单支付状态不正确, orderDTO={}", orderDTO);
            throw new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }
        //修改支付状态
        orderDTO.setPayStatus(PayStatusEnum.SUCCESS.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO, orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if(updateResult == null){
            log.error("【订单支付完成】更新失败, orderMaster={}", orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        return orderDTO;
    }

    @Override
    public Page<OrderDTO> findList(Pageable pageable) {
        Page<OrderMaster> orderMasterPage = orderMasterRepository.findAll(pageable);
        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());
        Page<OrderDTO> orderDTOPage = new PageImpl<OrderDTO>(orderDTOList, pageable, orderMasterPage.getTotalElements());

        return orderDTOPage;
    }
}
